视地层水电阻率正态分布分析及应用

通过多组随机正态分布序列数据正态频率分布绘图分析，指出正态分布序列数据的方差值越大，即储层段的视地层水电阻率分布范围较大时，正态频率分布曲线的斜率就越大；反之，正态分布序列数据的方差值越小，即储层段的视地层水电阻率分布比较集中时，正态频率分布曲线的斜率就越小。实际数据显示P^1/2 值越大，含气性越好；水层段P^1/2 值小，斜率小；通过该方法计算的地层水电阻率与水分析资料显示一致。     

Simulation-based life cycle assessment of energy efficiency of biomass-based ethanol fuel from different feedstocks in China

Interests in biomass-based fuel ethanol (BFE) have been re-boosted due to oil shortage and environmental deterioration. Biomass-based fuel ethanol is renewable and, apparently, environmentally friendly. Biomass-based E10 (a blend of 10% ethanol and 90% gasoline by volume) is a promising conventional gasoline substitute, because vehicle engines require no modifications to run on E10 and vehicle warranties are unaffected. This paper presented life cycle assessments (LCAs) of energy efficiency of wheat-based E10 from central China, corn-based E10 from northeast China, and cassava-based E10 from southwest China. The respective energy flow-based evaluation model of wheat-, corn-, and cassava-based E10 was built based on data from pilot BFE plants. Monte Carlo method is applied to deal with the uncertain parameters and input and output variables of the evaluation model because of its wide application and easy development of statistical dispersion of calculated quantities. According to the assessment results, the average energy input/output ratio of wheat-based fuel ethanol (WFE), corn-based fuel ethanol (CFE), and cassava-based fuel ethanol (KFE) is 0.70, 0.75, and 0.54, respectively, and biomass-based E10 vehicle can have less fossil energy demand than gasoline-fueled ones.     

Creation of regional added value by regional bioenergy resources

In debates about the positive effects of renewable and bioenergy projects the aspect of generating regional added value is discussed widely. But the real effects, generated by this regional added value stayed up to now on a non-measurable level. In order to expedite the calculation of these important figures, the author presents a field tested method for confidently arriving at useful values. This methodology takes into consideration the ecological, economical and social impact of a given biomass project's implementation. The model enables a comparison between the different renewable energy plants as well as between them and plants and technology of competing alternatives. Regional authorities are hereby enabled to count on a tool for confidently measuring the possible results of various bioenergy utilization technologies. With this knowledge at hand, they could then take qualified decisions towards positive effects for their region. The developed tool allows the definition of adjustable parameters, and therefore it is able to influence the regional framework regarding a more sustainable development.     

Goal-directed responding is sensitive to lesions to the prelimbic cortex or basolateral nucleus of the amygdala but not to their disconnection.

The current view of instrumental conditioning indicates that performance in the early stage of training is maintained by a representation of the outcome, as indexed by its sensitivity to changes in the value of the reward. In the present study, the authors tested the effects of a disconnection of the prelimbic cortex (PL) and the basolateral nucleus of the amygdale (BLA), using an asymmetric lesion procedure, to determine whether these structures interact sequentially as part of a corticolimbic system. In marked contrast to the effects of bilateral lesions of the PL or the BLA, which both altered rats' sensitivity to outcome devaluation, the disconnection of these 2 brain areas was without an effect on outcome devaluation. These results demonstrate that the PL and the BLA mediate different aspects of outcome representation in goal-directed responding. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On evaluating Weibull fits to mechanical testing data

The use of coefficient of determination, R², and the Anderson–Darling (A²) hypothesis test to evaluate the goodness-of-fit to the two-parameter Weibull distribution was investigated. Results of Monte Carlo simulations for sample sizes between 5 and 100 indicated that guidelines provided previously in the literature are too conservative for sample sizes up to 80. New guidelines for the use of R² and A² for sample sizes between 5 and 100 have been developed. The two measures of goodness-of-fit were found to agree more than 95% of the time, regardless of sample size. The use of the new guidelines has been demonstrated on two datasets from the casting literature.     

鱼的能量需要及对饲料能量的利用

文章分析了当前国内外鱼类能量测定的各种方法与差异,通过对己有实验数据分析发现,鱼类对饲料中碳水化合物的利用率较低,对蛋白质饲料的利用率较高.     

无约束最优化问题的特征值方法

本文讨论了利用变量变换求解二次可微函数ｆ（ｘ）的无约束最优化问题，给出了一个特征值方法，解决了Ｈｅｓｓｅ阵非正定时的搜索方向问题。实算表明，该算法在迭代次数和数值稳定性上均令人满意。     

建筑物建造与维护的最优经济对策

本文基于建筑物的不同破坏形式,提出了其建造和维护的最优经济模型,并用最优控制理论和价值工程的方法对模型加以分析和研究.文中阐述了建筑物的建造、维护和废止等阶段应为一体化连续决策过程的基本思想,讨论了各阶段的相关性和确定方法,并通过算例对上述理论加以说明.     

邯郸地区静力触探试验参数的分析与确定

静力触探试验是岩土工程勘察中最常用的原位测试手段之一、岩土工程试验参数的分折与选定，是岩土工程最基本的要求。本文结合几个实际工程项目，针对邯郸地区静力触探试验参数的分析、讨论和选用，阐明了参数的差异性分析在岩土工程中的重要性。并给出了一个经验系数．以便计算使用。     

一种采用微机求取自控系统ITAE值的方法

自动控制系统中经常采用ITAE准则,但应用分析法求取ITAE值却是困难的,本文提出了一种采用微型机求取自动控制系统ITAE值的方法,较好地解决了这一难题。